fixed an issue with requirements.txt not being found if not in root dir

[fpgmaas]

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

[codecov-commenter]

Codecov Report

Merging #94 (1f0153b) into main (2babe8a) will decrease coverage by 0.4%.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main     #94     +/-   ##
=======================================
- Coverage   96.1%   95.7%   -0.5%     
=======================================
  Files         30      30             
  Lines       1047    1055      +8     
=======================================
+ Hits        1007    1010      +3     
- Misses        40      45      +5     

Impacted Files	Coverage Δ
deptry/dependency_specification_detector.py	88.5% <100.0%> (ø)
tests/test_dependency_specification_detector.py	86.8% <100.0%> (-13.2%)	⬇️

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